Determination of fluid consumption
The method of operating an inkjet printing system includes ejecting usable fluid on a substrate in a print mode and in a purge container in a maintenance mode by a print head. The method also includes receiving recovered fluid from the purge container and source fluid from the source supply to form the usable fluid in a primary fluid tank. The method also includes receiving and providing an amount of the usable fluid from the primary fluid tank to the print head by at least one of a first supplemental fluid tank and a second supplemental fluid tank. The method also includes determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container.
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Inkjet printing systems may include a print head having nozzles and a fluid supply system to supply fluid such as ink to the print head. The print head may include a print mode to eject fluid onto a substrate and a maintenance mode to eject fluid to maintain the print head. In the maintenance mode, the print head may be purged by the ejection of fluid through the nozzles thereof.
Non-limiting examples are described in the following description, read with reference to the figures attached hereto and do not limit the scope of the claims. Dimensions of components and features illustrated in the figures are chosen primarily for convenience and clarity of presentation and are not necessarily to scale. Referring to the attached figures:
An inkjet printing system may include a print head having nozzles and a fluid supply system to supply fluid such as ink to the print head. An inkjet printing systems may include a commercial, high speed print press including print heads in a form of an elongated print head array including a plurality of print head modules. The print head may include a print mode to eject fluid onto a substrate and a maintenance mode to eject fluid to maintain the print head. In the print mode, for example, the print head may eject fluid through nozzles to form an image on a substrate. In the maintenance mode, the print head may be purged by the ejection of fluid through the nozzles. Fluid consumed by the print head may include fluid used by the print head in the print mode and the maintenance mode. For example, consumed fluid may be estimated by counting a number of ink droplets ejected from the print head may be counted in the print mode and estimating an amount of fluid used in the maintenance operation. Such information may be helpful to a user in planning print jobs and/or replenishing fluid supplies. However, actual amounts of consumed fluid consumed by the print head may differ from the estimated amounts due to drop volume changes, varying purging fluid amounts, and the like. Accordingly, efficiency in print job planning and/or fluid supply replenishment may be decreased.
In examples, the method of operating an inkjet printing system may include ejecting usable fluid on a substrate in a print mode and in a purge container in a maintenance mode by a print head. The method may also include receiving recovered fluid from the purge container and source fluid from the source supply to form the usable fluid in a primary fluid tank. The method may also include receiving and providing an amount of the usable fluid from the primary fluid tank to the print head by at least one of a first supplemental fluid tank and a second supplemental fluid tank. The method may also include determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container. Accordingly, the determination and use of an actual amount of recovered fluid and the amount of fluid used in the print mode through supplemental fluid tanks may provide the amount of fluid consumed even in an environment with drop volume changes and vary purging fluid amounts. Such information may be helpful to a user in planning print jobs and/or replenishing fluid supplies. Accordingly, efficiency in print job planning and/or fluid supply replenishment may be provided.
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In some examples, the fluid consumption module 14 may also determine a remaining amount ra of fluid in fluid supply system 10 based on an initial amount a of the source fluid reduced by the consumed amount ac of the usable fluid. That is, wherein ra=ai−ac, wherein ra corresponds to the remaining amount of fluid in fluid supply system 10, ai corresponds to the initial amount of the source fluid, and ac corresponds to the consumed amount of the usable fluid. Alternatively, the fluid consumption module 14 may determine the amount ar of the recovered fluid received by the primary fluid tank 11 from the purge container 13 by at least one of identification of the respective level of the usable fluid in the primary fluid tank 11 over respective periods of time by the primary float switch 21a and the weight of the usable fluid in the primary fluid tank 11 over the respective periods of time by the load cell 26.
In some examples, the second pump 25b may be initiated in response to the usable fluid in the primary fluid tank 11 reaching the first level I2 and deactivated in response to usable fluid reaching the fourth level I4. The second pump 25b may also be initiated in response to the usable fluid in the primary fluid tank 11 reaching the second level I2 and deactivated in response to the usable fluid reaching the third level I4 to maintain a normal operating level of usable fluid in the primary fluid tank 11. The usable fluid f from the second pump 25b (
In block S414, an amount of the usable fluid is received and provided from the primary fluid tank to the print head by at least one of a first supplemental fluid tank and a second supplemental fluid tank. For example, a first pump may be selectively activated to pump a first predetermined amount of the usable fluid from the primary fluid tank to the at least one of the first supplemental fluid tank and the second supplemental fluid tank. In block S416, a consumed amount of the usable fluid is determined corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container. For example, the amount of the usable fluid used by the print head may be calculated by multiplying a number of activations of the first pump by the first predetermined amount of the usable fluid. Additionally, the amount of the recovered fluid received by the primary fluid tank from the purge container may be calculated by multiplying a number of activations of the second pump to pump the second predetermined amount of the fluid purged from the print head by the second predetermined amount of the fluid purged from the print head.
In some examples, the method may also include selectively turning on and off the second pump based on a respective level of the usable fluid in the primary fluid tank by a primary float switch. Selectively turning on and off the first pump based on a respective level of the usable fluid in the at least one of the first supplemental fluid tank and the second supplemental fluid tank by supplemental float switches, respectively. Selectively turning on and off the second pump based on a respective level of the fluid purged from the print head in the purge container by a purge float switch. Additionally, a weight of the usable fluid in the primary fluid tank may be determined by a load cell coupled thereto.
Alternatively, the determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container may also include determining the amount of the recovered fluid received by the primary fluid tank from the purge container by at least one of identification of the respective level of the of the usable fluid in the primary fluid tank at respective times by the primary float switch and the weight of the usable fluid in the primary fluid tank over the respective times by the load cell.
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The present disclosure has been described using non-limiting detailed descriptions of examples thereof that are not intended to limit the scope of the general inventive concept. It should be understood that features and/or operations described with respect to one example may be used with other examples and that not all examples have all of the features and/or operations illustrated in a particular figure or described with respect to one of the examples. Variations of examples described will occur to persons of the art. Furthermore, the terms “comprise,” “include,” “have” and their conjugates, shall mean, when used in the disclosure and/or claims, “including but not necessarily limited to.”
it is noted that some of the above described examples may include structure, acts or details of structures and acts that may not be essential to the general inventive concept and which are described for illustrative purposes. Structure and acts described herein are replaceable by equivalents, which perform the same function, even if the structure or acts are different, as known in the art. Therefore, the scope of the general inventive concept is limited only by the elements and limitations as used in the claims.
Claims
1. A method of operating an inkjet printing system, the method comprising:
- ejecting usable fluid on a substrate in a print mode and in a purge container in a maintenance mode by a print head;
- receiving recovered fluid from the purge container and source fluid from the source supply to form the usable fluid in a primary fluid tank;
- providing an amount of the usable fluid from the primary fluid tank to the print head by a first supplemental fluid tank and a second supplemental fluid tank; and
- determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container.
2. The method according to claim 1, wherein the providing an amount of the usable fluid from the primary fluid tank to the print head by a first supplemental fluid tank and a second supplemental fluid tank further comprising
- selectively activating a first pump to pump a first predetermined amount of the usable fluid from the primary fluid tank to the first supplemental fluid tank and the second supplemental fluid tank.
3. The method according to claim 2, wherein the receiving recovered fluid from the purge container and source fluid from the source supply to form the usable fluid in a primary fluid tank further comprising:
- selectively activating a second pump to pump a second predetermined amount of the fluid purged from the print head into the purge container to the primary fluid tank and to pump a third predetermined amount of the source fluid from the source supply to the primary fluid tank.
4. The method according to claim 3, further comprising:
- selectively turning on and off the second pump based on a respective level of the usable fluid in the primary fluid tank by a primary float switch;
- selectively turning on and off the first pump based on a respective level of the usable fluid in the at least one of the first supplemental fluid tank and the second supplemental fluid tank by supplemental float switches, respectively;
- selectively turning on and off the second pump based on a respective level of the fluid purged from the print head in the purge container by a purge float switch; and
- determining a weight of the usable fluid in the primary fluid tank by a load cell coupled thereto.
5. The method according to claim 3, wherein the determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container further comprising:
- calculating the amount of the usable fluid used by the print head by multiplying a number of activations of the first pump by the first predetermined amount of the usable fluid; and
- calculating the amount of the recovered fluid received by the primary fluid tank from the purge container by multiplying a number of activations of the second pump to pump the second predetermined amount of the fluid purged from the print head into the purge container to the primary fluid tank by the second predetermined amount of the fluid purged from the print head.
6. The method according to claim 3, wherein the determining a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container further comprising:
- determining the amount of the recovered fluid received by the primary fluid tank from the purge container by at least one of identification of the respective level of the of the usable fluid in the primary fluid tank at respective times by the primary float switch and the weight of the usable fluid in the primary fluid tank over the respective times by the load cell.
7. An inkjet printing, system, comprising:
- a print head having a print mode and a maintenance mode, the print head including nozzles to eject usable fluid there through; and
- a fluid supply system to supply the usable fluid to the print head, the fluid supply system including:
- a purge container to receive an amount of the usable fluid ejected from the print head in the maintenance mode;
- a primary fluid tank to receive recovered fluid from the purge container and source fluid from a source supply to form the usable fluid;
- a first supplemental fluid tank and a second supplemental fluid tank to each receive and each provide an amount of the usable fluid from the primary fluid tank to the print head; and
- a fluid consumption module to determine a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container.
8. The inkjet printing system according to claim 7, further comprising:
- a first pump to be selectively activated to pump a first predetermined amount of the usable fluid from the primary fluid tank to the first supplemental fluid tank and the second supplemental fluid tank.
9. The inkjet printing system according to claim 8, further comprising: a first valve to direct the first predetermined amount of the usable fluid from the first pump to the at least one of the first supplemental fluid tank and the second supplemental fluid tank.
10. The inkjet printing system according to claim 7, further comprising: a second pump to be selectively activated to pump at least one of a second predetermined amount of the fluid purged from the print head into the purge container to the primary fluid tank and a third predetermined amount of the source fluid from the source supply to the primary fluid tank.
11. The inkjet printing system according to claim 10, further comprising: a second valve to direct at least one of the fluid from the purge container and the source fluid from the source supply to the second pump.
12. The inkjet printing system according to claim 11, wherein the purge container further comprises:
- a purge float switch to selectively turn on and off the second pump based on a respective level of the fluid purged from the print head in the purge container.
13. The inkjet printing system according to claim 11, wherein the fluid consumption module is configured to determine a remaining amount of fluid in fluid supply system based on an initial amount of the source fluid reduced by the consumed amount of the usable fluid.
14. The inkjet printing system according to claim 8, wherein each one of first supplemental fluid tank and the second supplemental fluid tank further comprise:
- a respective supplemental float switch to selectively turn on and off the first pump based on a respective level of the usable fluid in the first supplemental fluid tank and the second supplemental fluid tank.
15. The inkjet printing system according to claim 10, wherein the fluid consumption module further comprises:
- a calculation module to calculate the amount of the recovered fluid received by the primary fluid tank from the purge container by multiplying a number of activations of the second pump to pump the second predetermined amount of the fluid purged from the print head by the second predetermined amount of the fluid purged from the print head.
16. The inkjet printing system according to claim 8, wherein the fluid consumption module further comprises:
- a calculation module to calculate the amount of the usable fluid used by the print head by multiplying a number of activations of the first pump by the first predetermined amount of the usable fluid to determine the amount of the usable fluid used by the print head.
17. The inkjet printing system according to claim 7, wherein the primary fluid tank further comprises:
- a primary float switch to selectively turn on and off a second pump based on a respective level of the usable fluid in the primary fluid tank.
18. The inkjet printing system according to claim 17, further comprising: a load cell coupled to the primary fluid tank, the load cell to determine a weight of the usable fluid in the primary fluid tank.
19. The inkjet printing system according to claim 18, wherein the fluid consumption module is configured to determine the amount of the recovered fluid received by the primary fluid tank from the purge container by at least one of identification of the respective level of the usable fluid in the primary fluid tank over respective periods of time by the primary float switch and the weight of the usable fluid in the primary fluid tank over the respective periods of time by the load cell.
20. Anon-transitory computer-readable storage medium having computer executable instructions stored thereon to operate an inkjet printing system, the instructions are executable by a processor to:
- eject usable fluid on a substrate in a print mode and in a purge container in a maintenance mode by a print head;
- receive recovered fluid from the purge container and source fluid from the source supply to form the usable fluid in a primary fluid tank by selectively activating a second pump to pump at least one of a second predetermined amount of the fluid purged from the print head into the purge container to the primary fluid tank and a third predetermined amount of the source fluid from the source supply to the primary fluid tank;
- receive and provide an amount of the usable fluid from the primary fluid tank to the print head by a first supplemental fluid tank and a second supplemental fluid tank by selectively activating a first pump to pump a first predetermined amount of the usable fluid from the primary fluid tank to the at least one of the first supplemental fluid tank and the second supplemental fluid tank;
- selectively activate a second pump based on a purge float switch located in the purge container; and
- determine a consumed amount of the usable fluid corresponding to an amount of the usable fluid used by the print head reduced by an amount of the recovered fluid received by the primary fluid tank from the purge container.
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Type: Grant
Filed: Sep 27, 2012
Date of Patent: Jul 18, 2017
Patent Publication Number: 20140085361
Assignee: Hewlett-Packard Industrial Printing LTD. (Netanya)
Inventors: Semion Gengrinovich (Ramat Gan), Liad Weissman (Netanya), Lev Superfin (Netanya)
Primary Examiner: Lam Nguyen
Application Number: 13/628,350
International Classification: B41J 2/165 (20060101); B41J 2/175 (20060101);